*{
margin: 0;
padding: 0;
}
html, body {
background-color: #fff;
 }
 ul, ol, li {
list-style: none;
 }
 input, button, textarea, select {
outline: none;
 }
 button, select {
cursor: pointer;
 }
 a, a:link, a:hover, a:active, a:visited {
color: #333;
text-decoration: none;
 }
 img {
width: 100%;
height: 100%;
display: block;
cursor: pointer;
 }
 /* 准备一些公共类名 */
 .container {
width: 1240px;
margin: 0 auto;
 }
 .clearfix::after {
content: '';
display: block;
clear: both;
 }